Tokyo Sewage Treatment Facility as Radiated as Fukushima Evacuation Area

Tokyo Sewage Treatment Facility as Radiated as Fukushima Evacuation Area
Yomiuri Shimbun: 都の下水処理施設で高放射線量…避難区域に匹敵
June 8, 2011

A test of the air quality inside the sewage treatment plant in Ōda, Tokyo revealed that it is emitting about 2.7 microsieverts of radiation per hour.

That is nearly equal to the radiation level in the town of Iitate, which is part of the Fukushima evacuation area. According to the Ministry of Education, Culture, Sports, Science and Technology, this is the first time such a high level of radiation has been found inside the city. Radioactive material is thought to be inside the sludge, but the city also said “The test was done inside the building. There are no problems in the surrounding area.” They did not publicly announce their findings because they didn’t want any misunderstanding to trigger panic.

According to the capital, the sewage treatment facility is the “southern sludge plant,” one of the two locations in the city where sludge is collected and burned. The ashes are buried in Tokyo Bay among other places. According to a May test, those ashes contain 10,540 becquerels of cesium per kilogram.

When the city measured radiation on June 6, it found the airborne radiation in the facility was 2.693 microsieverts per hour. Hourly radiation in Iitate that same day was 2.86 microsieverts. If this radiation accumulated in a linear fashion for a year, it would rise to 23.6 millisieverts, which is higher than the 20 mSv standard for evacuating an area.

The city said that because the radiation outside the facility was only 0.038 microsieverts per hour, area residents should not worry about their health. Workers at the facility were again encouraged to wear masks and gloves.






(2011年6月8日14時33分 読売新聞)

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